US4661421A - Method for preparing a magnetic recording medium - Google Patents
Method for preparing a magnetic recording medium Download PDFInfo
- Publication number
- US4661421A US4661421A US06/906,008 US90600886A US4661421A US 4661421 A US4661421 A US 4661421A US 90600886 A US90600886 A US 90600886A US 4661421 A US4661421 A US 4661421A
- Authority
- US
- United States
- Prior art keywords
- polyester film
- magnetic
- film
- recording medium
- magnetic recording
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229920006267 polyester film Polymers 0.000 claims abstract description 51
- 229910052751 metal Inorganic materials 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 29
- 239000010409 thin film Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000000151 deposition Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 8
- 239000010408 film Substances 0.000 claims description 20
- 238000007740 vapor deposition Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 15
- 239000010410 layer Substances 0.000 description 13
- -1 polyethylene terephthalate Polymers 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229910017344 Fe2 O3 Inorganic materials 0.000 description 3
- 229910017368 Fe3 O4 Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/85—Coating a support with a magnetic layer by vapour deposition
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/739—Magnetic recording media substrates
- G11B5/73923—Organic polymer substrates
- G11B5/73927—Polyester substrates, e.g. polyethylene terephthalate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/90—Magnetic feature
Definitions
- the present invention relates to a method for preparing a magnetic recording medium which comprises forming a ferromagnetic metal thin film on a polyester film.
- a coated type magnetic recording medium that has been widely used is prepared by dispersing magnetic oxide particles such as ⁇ --Fe 2 O 3 , Co-doped ⁇ ---Fe 2 O 3 , Fe 3 O 4 , Co-doped Fe 3 O 4 , a Berthollide compound of ⁇ --Fe 2 O 3 and Fe 3 O 4 , a Co-doped Berthollide compound or CrO 2 , or magnetic alloy particles mainly composed of Fe, Co, Ni and the like in an organic binder such as a copolymer of vinyl chloride and vinyl acetate, a copolymer of styrene and butadiene, an epoxy resin or a polyurethane resin, coating the resulting coating composition on a non-magnetic support, and drying it.
- magnetic oxide particles such as ⁇ --Fe 2 O 3 , Co-doped ⁇ ---Fe 2 O 3 , Fe 3 O 4 , Co-doped Fe 3 O 4 , a Berthollide compound
- a thin metal film type magnetic recording medium of which ferromagnetic metal thin film is prepared by vapor deposition, sputtering, or ion plating without using a binder has drawn attention and has been developed to put into practice.
- a conventional coated type magnetic recording medium uses magnetic metal oxide particles having low saturation magnetization. Therefore, when a magnetic recording layer is made thinner in order to realize high density recording, the output of the signals is decreased.
- a thin metal film type magnetic recording medium uses ferromagnetic particles having higher saturation magnetization than magnetic metal oxide particles in the absence of a binder to prepare a magnetic recording layer. Therefore, the resulting magnetic recording layer can be made extremely thin and exhibits excellent electromagnetic properties.
- a polyester film is widely used as a non-magnetic support.
- a first object of the present invention is to provide a vapor deposition method for preparing a thin metal film type magnetic recording medium having an improved skew characteristic.
- a second object of the present invention is to provide a vapor deposition method for preparing a metal thin film type magnetic recording medium having excellent S/N characteristics of chroma signals and excellent reproduced signal envelope at wide wavelength regions.
- the present invention relates to a method for preparing a magnetic recording medium by vapor-depositing a magnetic metal film on a polyester film, which comprises winding up a polyester film while subjecting the polyester film to a tension of from 0.1 to 2.0 kg/mm 2 , heating the resulting polyester film roll at from 60° C. to 80° C. for from 10 to 100 hours, and vapor-depositing a magnetic metal film onto the polyester film while subjecting the polyester film to a tension of 0.5 kg/mm 2 or more.
- “Tension” referred to herein is defined as a force added to a cross-section of a polyester film.
- a magnetic recording medium which is prepared by the method which comprises winding up a polyester film while subjecting the polyester film to a tension of from 0.1 to 2.0 kg/mm 2 , preferably from 0.1 to 1.6 kg/mm 2 , and more preferably from 0.6 to 1.2 kg/mm 2 , heating it at from 60° C. to 80° C. for from 10 to 100 hours, preferably from 20 to 72 hours, and vapor-depositing a magnetic film onto the polyester film, while subjecting the polyester film to a tension of 0.5 kg/mm 2 or more.
- the vapor-deposited magnetic metal thin film of the present invention is composed of metals such as Fe, Co, Ni, and the like or ferromagnetic alloys such as Fe--Co, Fe--Ni, Co--Ni, Fe--Co--Ni, Fe--Rh, Fe--Cu, Fe--Si, Co--Cu, Co--Au, Co--Y, Co--La, Co--Pr, Co--Gd, Co--Sm, Co--Pt, Co--Si, Co--Mn, Co--P, Ni--Cu, Mn--Bi, Mn--Sb, Mn--Al, Fe--Cr, Co--Cr, Ni--Cr, Fe--P, Ni--P, Co--Ni--P, Co--Ni--B, Co--Ni-Ag, Co--Ni--Cr, Fe--Co---Cr, Fe--Co--Ni-
- a metal or ferromagnetic alloy containing Co is used, and more preferably a metal or ferromagnetic alloy containing 50 wt% or more of Co per the total weight of the magnetic metal is used.
- the thickness of the magnetic film is generally from 0.02 to 5.0 microns, preferably from 0.05 to 2.0 microns, and more preferably from 0.07 to 1.5 microns so that sufficient output can be produced as a magnetic recording medium and that high density recording can be carried out satisfactorily.
- elements such as O, N, C, and the like can be incorporated into a magnetic metal thin film.
- a polyester film used in the present invention is not limited. Specific examples thereof include polyethylene terephthalate, polymethylene terephthalate, polyethylene-2-6-naphthalate, and polyethylene isophthalate.
- the thickness of the polyester film is generally from 2 to 100 microns, preferably from 3 to 50 microns, and more preferably from 5 to 20 microns.
- Ga, As, Sr, Zr, Nb, Mo, Sn, Sb, Te, Os, Ir, Au, Ag, Pb, Bi, and the like can be incorporated into the ferromagnetic metal thin film for a purpose of improving the magnetic properties (e.g., coercive force, saturated magnetic flux density, etc.).
- An amount of these metals used is preferably from 0 to 10 wt%, and more preferably from 0 to 5 wt% per total weight of ferromagnetic metal thin film.
- the non-vapor deposited surface of the polyester film be contacted with a cooling roller cooled to a temperature of generally from -50° C. to 10° C., preferably from -40° C. to 5° C., and more preferably from -30° C. to 5° C.
- the tension to which the film is subjected during vapor deposition in the present invention is 0.5 kg/mm 2 or more, and preferably 0.6 kg/mm 2 or more and it is practical that the upper limit of the tension is about 1/4, and preferably about 1/5, that of the breaking strength of the polyester film.
- the ferromagnetic film may be a single layer or a multi-layer as described in U.S. Pat. No.4,410,583, and a non-magnetic layer (as interlayer) can be present between the magnetic layers.
- a non-magnetic layer as interlayer
- an underlayer may be provided between a polyester film and a ferromagnetic metal thin film, which compose a magnetic layer, and a protective layer or a lubricating layer may also be provided on a magnetic layer as described in U.S. Pat. Nos. 4,333,985 and 4,425,404.
- a backing layer may be provided on the surface of a polyester film opposite to the surface having a magnetic layer.
- interlayer, the underlayer, protective layer, and the like are vapor deposited, it is preferred that a tension of 5 kg/mm 2 or more needs to be added.
- these interlayer, underlayer, protective layer, and the like are provided by a wet coating method, generally used drying conditions can be applied.
- a vapor deposition type magnetic recording medium having improved skew characteristics and electromagnetic properties can be obtained by a specific selecting of conditions which are subjected to heat treatment before vapor deposition, and during vapor deposition.
- the resulting ferromagnetic metal thin film was the film prepared by an oblique incident evaporation method and composed of Co-Ni alloy (Ni content: 20 wt%, Oxygen content: 14 atomic%), and having a thickness of 1800 ⁇ .
- Magnetic tapes on which recording was conducted using a 8 mm VTR "FUJIX-8 m 6," (trademark for product of Fuji Photo Film Co., Ltd.) at 25° C. and 70% RH (relative humidity) were allowed to stand for 48 hours at 70° C. and under dry condition, and then skew was measured by reproducing the tapes at 25° C. and 70% RH.
- the magnetic tapes having a skew value of 25 ⁇ sec or less are suitable for practical use.
- the evaluation of the envelope was made on the following five grades in view of its shape.
- a ferromagnetic metal thin film was vapor deposited by a continuous vapor deposition apparatus while the polyester film was subjected to various tensions, after which the film was subjected to heat treatment in the same manner as in Example 1.
- the ferromagnetic metal thin film was composed of CoCr alloy (Cr content: 15 wt%), and having a thickness of 2200 ⁇ .
- a thin metal film type magnetic recording medium having excellent skew characteristics, chroma S/N ratio and envelope can be obtained.
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
- Magnetic Record Carriers (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60202794A JPS6262433A (ja) | 1985-09-13 | 1985-09-13 | 磁気記録媒体の製造方法 |
| JP60-202794 | 1985-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4661421A true US4661421A (en) | 1987-04-28 |
Family
ID=16463296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/906,008 Expired - Lifetime US4661421A (en) | 1985-09-13 | 1986-09-11 | Method for preparing a magnetic recording medium |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4661421A (en]) |
| JP (1) | JPS6262433A (en]) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5192584A (en) * | 1991-01-09 | 1993-03-09 | Fuji Photo Film Co., Ltd. | Method for manufacturing magnetic recording medium |
| US20030205850A1 (en) * | 2000-09-25 | 2003-11-06 | Zwettler Christopher J. | Manufacture of magnetic tape under heat treatment and tension |
| US20040197509A1 (en) * | 1999-12-28 | 2004-10-07 | Ieyasu Kobayashi | Polyester film roll |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5816495A (ja) * | 1981-07-22 | 1983-01-31 | 高周波熱錬株式会社 | 加熱面の測温可能な誘導子 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4446170A (en) * | 1982-08-02 | 1984-05-01 | Olympus Optical Co., Ltd. | Method of manufacturing a magnetic recording film of a thin metallic film type |
| US4474832A (en) * | 1982-03-16 | 1984-10-02 | Fuji Photo Film Company Limited | Magnetic recording media |
-
1985
- 1985-09-13 JP JP60202794A patent/JPS6262433A/ja active Granted
-
1986
- 1986-09-11 US US06/906,008 patent/US4661421A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474832A (en) * | 1982-03-16 | 1984-10-02 | Fuji Photo Film Company Limited | Magnetic recording media |
| US4446170A (en) * | 1982-08-02 | 1984-05-01 | Olympus Optical Co., Ltd. | Method of manufacturing a magnetic recording film of a thin metallic film type |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5192584A (en) * | 1991-01-09 | 1993-03-09 | Fuji Photo Film Co., Ltd. | Method for manufacturing magnetic recording medium |
| US20040197509A1 (en) * | 1999-12-28 | 2004-10-07 | Ieyasu Kobayashi | Polyester film roll |
| US8191812B2 (en) | 1999-12-28 | 2012-06-05 | Teijin Limited | Polyester film roll |
| US8485460B2 (en) * | 1999-12-28 | 2013-07-16 | Teijin Limited | Polyester film roll |
| US20030205850A1 (en) * | 2000-09-25 | 2003-11-06 | Zwettler Christopher J. | Manufacture of magnetic tape under heat treatment and tension |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0576703B2 (en]) | 1993-10-25 |
| JPS6262433A (ja) | 1987-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: FUJI PHOTO FILM CO., LTD., NO. 210, NAKANUMA, MINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ISHIKURO, TADASHI;HONDA, KUNIHIKO;OHTA, MASATAKA;AND OTHERS;REEL/FRAME:004660/0784 Effective date: 19860820 Owner name: FUJI PHOTO FILM CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ISHIKURO, TADASHI;HONDA, KUNIHIKO;OHTA, MASATAKA;AND OTHERS;REEL/FRAME:004660/0784 Effective date: 19860820 |
|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
| FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
| FPAY | Fee payment |
Year of fee payment: 4 |
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| FPAY | Fee payment |
Year of fee payment: 8 |
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| FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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| FPAY | Fee payment |
Year of fee payment: 12 |